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I will do further tests around the magnet polarization as you suggest.
I noticed the difference between the two red and blue lines, I saw that in your setup they were practically coincident while in my no, but I could not find a way to align them.
I think I have verified the polarity of the magnets well, but I will try again.
For example, I also tried to invert the poles of the coil changing the wire position on the connector in order to reverse the polarity.
For the filters, both coil and sensor, I tried all the possible combinations, it seems very strange also to me that the sensor filter should be so high but if I lower it all becomes even more unstable.
I redo the whole magnet setup from scratch and then I will keep you update.
For a few days I will be out of country for working reasons, so I think that I cannot update you before the first days of next week.
I hope that our chat can also help others people.
Thank you for your suggestions.